12V / 6mV is ~33 dB SNR. What’s more is that the 6 mV ripple on this supply’s 12V rail is p-p and not RMS. So for most apples to apples measurements it’d be m

12V / 6mV is ~33 dB SNR. What’s more is that the 6 mV ripple on this supply’s 12V rail is p-p and not RMS. So for most apples to apples measurements it’d be more accurate to say the SNR is closer to 35 dB. Regardless, seasonic supplies, and this one in particular, are very low noise. Most supplies are closer to 30mV ripple on the 12V rail.